<?php
/**
 * Copyright (c) 2010, Slawomir Mazur <mazursllawek@gmail.com>
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions 
 * are met:
 * 
 * o Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer.
 * o Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * o Neither the name of the Softisland nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/**
 * Enter description here...
 *
 * @package     default
 * @copyright   Slawomir Mazur (c) 2010 (http://www.zend.com/zce.php?c=ZEND011643)
 * @license     http://www.opensource.org/licenses/bsd-license.php
 * @author      Slawomir Mazur <mazursllawek@gmail.com>
 */

class Gp_Auth_UserAuth implements Zend_Auth_Adapter_Interface
{	
	/**
	 * Admin authentication adapter instance
	 * 
	 * @var Gp_Auth_AdminAuth
	 */
	private static $_instance = null;
	
	private $_userData = array();
	
	/**
	 * Storage instance
	 * 
	 * @var Zend_Auth_Storage_Session
	 */
	private $_storage = null;
	
	const FRONTEND_USER_NAMESPACE = 'FRONTEND_USER';
	
	/**
	 * Singleton pattern
	 * 
	 */
	private function __construct() { }
	
	private function __clone() { }
	
	public static function getInstance()
	{
		if (is_null(self::$_instance)) {
			self::$_instance = new self();
		}
		
		return self::$_instance;
	}
	
	public function setAuthData(array $data = array())
	{
		$this->_userData = $data;
		return $this;
	}
	
	public function authenticate()
	{
		if (empty($this->_userData) || !(count($this->_userData) > 1) ||
			!isset($this->_userData['login']) || empty($this->_userData['login']) ||
			!isset($this->_userData['password']) || empty($this->_userData['password'])) {
			
			throw new Exception('Fill in the missing data!');							
		}
		
		$user = Gp_App::getSingleton('cms/user');

		try {
			$user->login($this->_userData['login'], $this->_userData['password']);
			$user->updateData();
			
			$storage = $this->getStorage();			
			$storage->write($user->asRowObject());
			
			return true;
		} catch (Exception $e) {
			throw new Exception($e->getMessage());
		}
		
		return false;
	}
	
	/**
     * Get currently logged in user
     * 
     * @return Model_User as row object 
     * @see Model_User / public function asRowObject()
     */
    public function getUser()
    {
    	return $this->getStorage()->read();
    }
    
	/**
     * Get currently logged user id
     * 
     * @return int admin id 
     */
    public function getUserId()
    {
    	return $this->getStorage()->read()->user_id;
    }
	
	public function isLoggedIn()
	{
		return !is_null($this->getStorage()->read());
	}
	
	/**
     * Get the current user identity if it exists
     *
     * @return zend_auth_response|null
     */
    public function getIdentity()
    {
        if (isset($this->getStorage()->read()->email)) {
        	return $this->getStorage()->read()->email;
        }
        return null;
    }

    /**
     * Destroys the current user session
     *
     */
    public function destroy()
    {
        $this->getStorage()->clear();
    }
    
    public function getStorage()
    {
		if (is_null($this->_storage)) {
			$this->_storage = new Zend_Auth_Storage_Session(self::FRONTEND_USER_NAMESPACE);
		}			
		return $this->_storage;
    }
}